/*		DirectDraw using DGA or Xlib(XSHM)
 *
 * Copyright 1997-1999 Marcus Meissner
 * Copyright 1998 Lionel Ulmer (most of Direct3D stuff)
 */
#include "config.h"

#include <unistd.h>
#include <assert.h>
#include <fcntl.h>
#include <string.h>
#include <stdio.h>

#include "winerror.h"
#include "options.h"
#include "debugtools.h"
#include "ddraw.h"

DEFAULT_DEBUG_CHANNEL(ddraw);

#include "x11_private.h"

#ifdef HAVE_LIBXXSHM
int XShmErrorFlag = 0;
#endif

static inline BOOL get_option( const char *name, BOOL def ) {
    return PROFILE_GetWineIniBool( "x11drv", name, def );
}

static BOOL
DDRAW_XSHM_Available(void) {
#ifdef HAVE_LIBXXSHM
    if (get_option( "UseXShm", 1 )) {
	if (TSXShmQueryExtension(display)) {
	    int		major,minor;
	    Bool	shpix;

	    if (TSXShmQueryVersion(display, &major, &minor, &shpix))
		return TRUE;
	}
    }
#endif
    return FALSE;
}

static HRESULT X11_Create( LPDIRECTDRAW *lplpDD ) {
    IDirectDrawImpl*	ddraw;
    int			depth;
    x11_dd_private	*x11priv;

    if (lplpDD == NULL) /* Testing ... this driver works all the time */
	return DD_OK;

    *lplpDD = (LPDIRECTDRAW)HeapAlloc(
	GetProcessHeap(),
	HEAP_ZERO_MEMORY,
	sizeof(IDirectDrawImpl)
    );
    ddraw = (IDirectDrawImpl*)*lplpDD;
    ICOM_VTBL(ddraw)= &xlib_ddvt;
    ddraw->ref	= 1;

    ddraw->d = HeapAlloc(GetProcessHeap(),HEAP_ZERO_MEMORY,sizeof(*(ddraw->d)));
    ddraw->d->ref = 1;
    ddraw->d->private	= HeapAlloc(
	GetProcessHeap(),
	HEAP_ZERO_MEMORY,
	sizeof(x11_dd_private)
    );
    x11priv = (x11_dd_private*)ddraw->d->private;

    /* At DirectDraw creation, the depth is the default depth */
    depth = DefaultDepthOfScreen(X11DRV_GetXScreen());

    switch (_common_depth_to_pixelformat(depth,(LPDIRECTDRAW)ddraw)) {
    case -2: ERR("no depth conversion mode for depth %d found\n",depth); break;
    case -1: WARN("No conversion needed for depth %d.\n",depth); break;
    case 0: MESSAGE("Conversion needed from %d.\n",depth); break;
    }

    ddraw->d->height = GetSystemMetrics(SM_CYSCREEN);
    ddraw->d->width = GetSystemMetrics(SM_CXSCREEN);
#ifdef HAVE_LIBXXSHM
    /* Test if XShm is available. */
    if ((x11priv->xshm_active = DDRAW_XSHM_Available())) {
	x11priv->xshm_compl = 0;
	TRACE("Using XShm extension.\n");
    }
#endif
    return DD_OK;
}

/* Where do these GUIDs come from?  mkuuid.
 * They exist solely to distinguish between the targets Wine support,
 * and should be different than any other GUIDs in existence.
 */
static GUID X11_DirectDraw_GUID = { /* 1574a740-dc61-11d1-8407-f7875a7d1879 */
    0x1574a740,
    0xdc61,
    0x11d1,
    {0x84, 0x07, 0xf7, 0x87, 0x5a, 0x7d, 0x18, 0x79}
};

ddraw_driver x11_driver = {
    &X11_DirectDraw_GUID,
    "display",
    "WINE X11 DirectDraw Driver",
    50,
    X11_Create
}; 

DECL_GLOBAL_CONSTRUCTOR(X11_register) { ddraw_register_driver(&x11_driver); }